KVM guest: Make pv trampoline code executable

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Our PV guest patching code assembles chunks of instructions on the fly when it
encounters more complicated instructions to hijack. These instructions need
to live in a section that we don't mark as non-executable, as otherwise we
fault when jumping there.

Right now we put it into the .bss section where it automatically gets marked
as non-executable. Add a check to the NX setting function to ensure that we
leave these particular pages executable.

Signed-off-by: Alexander Graf <agraf@suse.de>

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This commit is contained in:

Alexander Graf 2014-04-29 12:17:26 +02:00

parent ab78475c76

commit b18db0b808

3 changed files with 16 additions and 1 deletions

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11

arch/powerpc/include/asm/sections.h

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2

arch/powerpc/kernel/kvm.c

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4

arch/powerpc/mm/hash_utils_64.c

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